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Masses - PowerPoint PPT Presentation


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Masses. Air Pressure. Air pressure is the force of air, exerted on the objects on Earth’s surface W e are being pushed from every direction Pressure is measured by a tool that we call a barometer Pressure, or changes in air pressures are what give us winds. Air Pressure.

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Presentation Transcript
air pressure
Air Pressure
  • Air pressure is the force of air, exerted on the objects on Earth’s surface
  • We are being pushed from every direction
  • Pressure is measured by a tool that we call a barometer
  • Pressure, or changes in air pressures are what give us winds
air pressure1
Air Pressure
  • Air movement (wind) moves from areas of high pressure to areas of low pressure
  • The Corioliseffect, the rotation of Earth that causes the ocean currents to deflect, will also cause the wind to deflect as well
    • Northern Hemisphere → Right
    • Southern Hemisphere → Left
  • Wind speed is measured by an instrument known as a aneometer
pressure centers
Pressure Centers
  • Pressure Centers are areas where concentrated pressure will affect the weather in a given area.
  • There are two types of Pressure Centers

1. High Pressure Centers (Cyclones)

    • Pressure will be highest on the inside and lowest on the outside
    • Winds will blow clockwise and outwards from the centers
    • accompanied by fair weather and sunny skies
pressure centers1
Pressure Centers

2. Low Pressure Centers (Anti-cyclones)

  • Pressure will be highest on the outside and lowest on the inside
  • Winds will blow counterclockwise and outwards towards the center of a center.
  • Accompanied with poor weather and rain
pressure map
Pressure Map
  • Isobars or lines of equal pressure are shown on the map
  • When isobars are close together, the winds will have a higher velocity
  • When isobars are far apart or spread out, the winds will have a lower velocity
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